bezier curve on mac10 advanced peeps

[episode]

i am makin a mac10, and anyone formiluar with that weapon would know thier is a rail on the back of the gun, check it out here
www.geocities.com/xyklonvirus/curve

anyways i have it perfectly set up... and some reason when i am doin the dupliframe it has a knot in the front end curve in the middle of the gun.... i cant fix it, i have applied size and rotation on the path and it fixes the knot but it creates a wierd curvin shape going down the bars which are suppose to be straight on the back of the gun, i tried fixing it all day and am desperate for advice.


pls help

 

[Mikademius]

Why don't you just extrude a face along the whole path? What have you done so far? Post a screenshot.